#!/usr/bin/env bash
# Summary: Configure the shell environment for rbenv
# Usage: eval "$(rbenv init - [--no-rehash] [<shell>])"

set -e
[ -n "$RBENV_DEBUG" ] && set -x

# Provide rbenv completions
if [ "$1" = "--complete" ]; then
  echo -
  echo --no-rehash
  echo bash
  echo fish
  echo ksh
  echo zsh
  exit
fi

print=""
no_rehash=""
for args in "$@"
do
  if [ "$args" = "-" ]; then
    print=1
    shift
  fi

  if [ "$args" = "--no-rehash" ]; then
    no_rehash=1
    shift
  fi
done

shell="$1"
if [ -z "$shell" ]; then
  shell="$(ps -p "$PPID" -o 'args=' 2>/dev/null || true)"
  shell="${shell%% *}"
  shell="${shell##-}"
  shell="${shell:-$SHELL}"
  shell="${shell##*/}"
  shell="${shell%%-*}"
fi

root="${BASH_SOURCE:-$0}"
root="${root%/*}"
root="${root%/*}"

rbenv_in_path=true
if [ -n "$RBENV_ORIG_PATH" ]; then
  PATH="$RBENV_ORIG_PATH" type -P rbenv >/dev/null || rbenv_in_path=""
fi

if [ -z "$print" ]; then
  case "$shell" in
  bash )
    if [ -f "${HOME}/.bashrc" ] && [ ! -f "${HOME}/.bash_profile" ]; then
      profile='~/.bashrc'
    else
      profile='~/.bash_profile'
    fi
    ;;
  zsh )
    profile='~/.zshrc'
    ;;
  ksh | ksh93 | mksh )
    # There are two implementations of Korn shell: AT&T (ksh93) and Mir (mksh).
    # Systems may have them installed under those names, or as ksh, so those
    # are recognized here. The obsolete ksh88 (subsumed by ksh93) and pdksh
    # (subsumed by mksh) are not included, since they are unlikely to still
    # be in use as interactive shells anywhere.
    profile='~/.profile'
    ;;
  fish )
    profile='~/.config/fish/config.fish'
    ;;
  * )
    profile='your profile'
    ;;
  esac

  rbenv_command=rbenv
  if [ -z "$rbenv_in_path" ]; then
    rbenv_command="$root/bin/rbenv"
    rbenv_command="${rbenv_command/$HOME\//~/}"
  fi

  { echo "# Please add the following line to your \`${profile}' file,"
    echo "# then restart your terminal."
    echo
    [ -t 2 ] && printf '\e[33;1m'
    case "$shell" in
    fish )
      printf 'status --is-interactive; and %s init - fish | source' "$rbenv_command"
      ;;
    * )
      # shellcheck disable=SC2016
      printf 'eval "$(%s init - %s)"' "$rbenv_command" "$shell"
      ;;
    esac
    [ -t 2 ] && printf '\e[m'
    echo
    echo
  } >&2

  exit 1
fi

mkdir -p "${RBENV_ROOT}/"{shims,versions}

case "$shell" in
fish )
  [ -n "$rbenv_in_path" ] || printf "set -gx PATH '%s/bin' \$PATH\n" "$root"
  printf "set -gx PATH '%s/shims' \$PATH\n" "$RBENV_ROOT"
  printf 'set -gx RBENV_SHELL %s\n' "$shell"
;;
* )
  # shellcheck disable=SC2016
  [ -n "$rbenv_in_path" ] || printf 'export PATH="%s/bin:${PATH}"\n' "$root"
  # shellcheck disable=SC2016
  printf 'export PATH="%s/shims:${PATH}"\n' "$RBENV_ROOT"
  printf 'export RBENV_SHELL=%s\n' "$shell"

  completion="${root}/completions/rbenv.${shell}"
  if [ -r "$completion" ]; then
    printf "source '%s'\n" "$completion"
  fi
;;
esac

if [ -z "$no_rehash" ]; then
  echo 'command rbenv rehash 2>/dev/null'
fi

IFS=$'\n' read -d '' -r -a commands <<<"$(rbenv-commands --sh)" || true

case "$shell" in
fish )
  cat <<EOS
function rbenv
  set command \$argv[1]
  set -e argv[1]

  switch "\$command"
  case ${commands[*]}
    rbenv "sh-\$command" \$argv|source
  case '*'
    command rbenv "\$command" \$argv
  end
end
EOS
  ;;
ksh | ksh93 | mksh )
  cat <<EOS
function rbenv {
  typeset command
EOS
  ;;
* )
  cat <<EOS
rbenv() {
  local command
EOS
  ;;
esac

if [ "$shell" != "fish" ]; then
IFS="|"
cat <<EOS
  command="\${1:-}"
  if [ "\$#" -gt 0 ]; then
    shift
  fi

  case "\$command" in
  ${commands[*]})
    eval "\$(rbenv "sh-\$command" "\$@")";;
  *)
    command rbenv "\$command" "\$@";;
  esac
}
EOS
fi
